Mixing apparatus.



T. AHLBORN.

MIXING APPARATUS.

APPLICATION FILED FEB. 7, 1914.

137 1 Patented Feb. 2,1915;

2 SHEETS-SHEET 1.

fwdamfilarm Z V IN VENTOR. I

A TTORNE YS.

1. AHLBORN.

MIXING APPARATUS.

APPLICATION FILE-II FEBJ. m4.

1 1K150. Patented Feb. 2, 19154 2 SHEETSSHEET 2,

1W VEN TOR.

A TTORNE YS.

THEODORE AHLIBOBN, OF CHICAGO, ILLINOIS.

MIXING- APPARATUS.

To all'whom it'may concern:

Be it knownthat I, THEODORE AHLBORN,

a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented certain new and useiulImprovements in Mixing Apparatus, of

, which the following is a specificatibn.

This invention relates to apparatus for mixing concrete and analogousmaterial, and its ob ect is toprovide a mixer of simple and durableconstruction characterized by a rotatable drum, the axis of which isinclined, in which drum, at the bottom thereof, is located a cone whichserves as a closure for the outlet or discharge opening of the drum. andalso as a means for expediting the mixing process. Novel means forsupporting the cone areprovided', whereby the cone may be tilted touncover the outlet. Without stopping the drum.

In order that theinventi'on may be better understood, reference is hadto the accompanying drawings, in which- Figure 1' is a side elevationofthea-pparatus; Fig.2 is a rear elevation thereof; Fig. 3is a verticalsection on the line 3-3 of Fig.

2, and Fig. 4 is an-elevation of 'thedischarge spout of the mixing drum.

Referring specifically tothe drawings, 5-

denotes two channel beams whichserve as sill's for supporting the frameor base of the apparatus. the same comprising a base plate 6, sidewalls7, a-rear wall 8"and a front wall 9, all integral with the baseplate. Between these walls is mounted a rotatable mixing drum or vesselcomposed of' a bowl-shaped lower part 1'0 and alighter frustal' upperpart 11 suitably fastened together. The part 11 is open at its upper endthrough which the material to be mixed is thrown. At its junction withthe part 11, the part 10 has an external rim 12 the under side of whichis toothed to form a gear ring 13; To the rear'of the part 10. onopposite sides thereof, below the axis of the drum, are locatedrotatable disks or rollers 14' j ournaled i'n suitablebearings' on thewalls 7. The disks have stepped peripheries to engage the smooth edgeand top portions of the rim 12. The mixingdrum is so positioned that itsaxis'is inclined, and the disks 14' are therefore located to actas asupport for the drumto prevent the same from tilting downward. The drumis re- Specification of Letters Patent. Application filed February 7,1914. Seri'a-I No. 817,235:

Patented Feb. 2, I915.

The bottom of the bowl-shaped part 1 0 has,

acentra-l' discharge opening from which extends a taperingspout 19, andat said discharge opening the wall of the bowl is thickened and shapedto form an external annular' bearing shoulder 20 which is opposite abearing ring 2] formed integral with a Wall 22 rising from the baseplate 6'. The lower portion of the bearing ring connects integrally withthe wall 9. The wall 22has an opening 23 to accomodate' the spout 19,and a curved web 24 extends between the walls 9 and 22' for the purposeof a reinforcement.

Thev herein described integral construction: of the supporting frame ofthe mixing drum makes-a rigid and durable bottom sup-- mixing drum, atthe discharge opening, is'

an: annular depression 26' which for-ms a seat for a hollow cone-shapedmember 27 open at its base-and having thereat' a curled reinforced-rim:28 which engages, the seat. The side of the cone is slightly concave asshown in Fig. 3- to reduce its volume The axis of the cone is parallelto and" coincides with the axis of the mixing drum, and from its apexprojects a stem 29 having intermediate it's ends a spherical enlargement30; The stem and sphere are located in a housing 31 which ismade up'oftwo parts bolted or otherwise -fastenedtogether to permit assemblage ofthe parts. Inthe housing isa seat for-thesphere or ball 30, andabove'the seat is a recess 32to-accommodate the projecting end of thestem 29; The width of the recess is such that thestemis prevented frommoving laterally therein"; Thus the stem: can move only in'a= verticalplane, parallel to and coinciding with the axis ofrotation of the mixingdrum, and the coneis constrained to swing in this plane only.

' facilitates the discharge.

The housing 31 is carried by the lower end of a rod 33 extending downinto the mixing drum through the upper open end thereof, and said rod isconnected to and depends from the middle of a bail 34, the ends of whichstraddle the mixing drum and are pivoted at 35 in the side walls 7 Thebail ends have continuations 36 carrying counterweights 37.

In the mixing drum are suitable mixing blades 38 secured to the wallsthereof and projecting inward.

, Tn operation, the cone 27 is positioned as shown in full. lines inFig. 3 to close the discharge or outlet opening of the part 10 of. themixing drum. The material to be mixed may now be thrown into the drum,and the latter is then set in motion through the drive gearinghereinbefore described, the drum being revolved about its inclined axis.The cone 27 is also free to turn by reason of the ball-and-socketbearing formed by the parts 30 and 31. To empty the drum, the bail 34 ispulled rearward, whereupon, through its connection with the cone, thelatter is tilted away from the the bowl 10, and the con foutlet openingin tents of the drum are then discharged through the spent 19. When thedrum is emptied, the bail is released, whereupon the weights 37 swing itback to restore to its normal position. The cone can be tilted withoutstopping the drum, which The turning point of the cone is the lowerportion of the base rim 28, from which point the pivots 35 of the ballare slightly oifset, which allows the rim to move on the seat 26 and notwear the latter in one place only. The cone also serves to hasten themixing process by pushing the material back to the blades 38.

While the preferred embodiment of the has been shown and described, it

invention is to be understood that many changes in the structuraldetails may be made without departure from the spirit and scope of theinvention as claimed hereinafter.

I claim:

1. .A mixing apparatus comprising an in clined rotatable drum having .anoutlet at its lower end, and an annular seat surrounding the outlet, anaxially located inwardly extending closure in the drum engaging saidseat, and means for tilting said closure from the seat.

2. A mixing apparatus comprising an inclined rotatable drum havinganoutlet at its lower end, an axially located inwardly extending closurein the drum seating loosely over the outlet, and a tiltable support forthe closure having a rotatable connection with the outerend thereof.

3. A mixing apparatus comprising an inclined rotatable drum having anoutlet at the cone .its lower end, and an annular seat surroundforguiding loosely over the outlet, a-

ing the outlet, an axially located inwardly extending closure in thedrum loosely engaging said seat, and a tiltable support for the closurehaving a rotatable connection with the outer end thereof.

4. A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end, an axially located inwardly the drum seatinglower end" on the outlet, a

and a bearing carried by said member and supporting the upper end of theclosure.

6. A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end, an axially located inwardly extending. closurein the drum seating loosely over the outlet, a tiltable support for theclosure having a rotatable connection with the outer end thereof. andmeans the closure to move in a vertical plane parallel to and coincidingwith the axis of the drum.

7. A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end, an axially located-inwardly extending closurein the drum seating stem projecting axially from the outer end of .theclosure and having a sphere. a supporting member in the drum providedwith a socket for the sphere and a. recess for the stem, in which saidstem is held against lateral movement but free to swing in a planeparallel to the,

axis of the drum, and a swinging support for said member. I y

8. A mixing apparatus. comprising an in clined rotatable drum its lowerend, an axially located inwardly extending closure in the drum rotatablysea-ting at its lower end over the outlet, a bearing in the drumsupporting the upper end of the closure, and a pivoted member outsidethe drum having a connection with the bearing for tilting the closuretoward and from the outlet.

9. A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end, an axially located conical closure in the drum,the base of the cone seating over the outlet and its apex extendinginward. and a pivoted member carrying a bearing for supporting theapexof the cone.

10." A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end; an axially located conical closure in the drum,the baseof the cone seating over the outlet and itsapex extendinginward, a bearing in the drum supporting the apex of the cone, and apivoted member outside the'drum having a supporting connection with thebearing.

11. A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end, an axially located conical closure in'the drum,the base of the cone seating over the outlet and its apexextending'inward, and a tiltable support for the cone having a bearingfor the apex thereof.

12. A mixing apparatus comprising an inclined rotatable drum having anoutlet at its lower end, an axially located conical closure in the drum,the base of the cone seating over the outlet and its apex extendinginward, and a tiltable support for the Intestimony whereof I aflix mysignature 30 in presence of two witnesses.

THEODORE AHLBORN.

,Witnesses:

S. J. LEHRER, H. G. BATGHEIOR.

